What is Java Virtual Machine?

Java Virtual Machine (JVM) Java is an important software that helps in running Java programs. It is only through this that the main advantage of Java ‘write once, run anywhere’ has become possible. In this post we will talk about Java Virtual Machine (JVM) in detail, like how it works, what are its advantages and disadvantages, and also see some examples of its usage –

What is JVM?

JVM is a virtual machine which java bytecode Interprets it and runs it as a program. this one Runtime Environment Provides which completes this process. Main features of JVM are:

1. class loader: It loads .class files, which are in the form of Java code.
2. runtime data area: It manages the memory for the program, making it possible for the program to function properly.
3. execution engine: It converts the bytecode into machine code and runs it, thereby carrying out the commercial execution of the program.

How does JVM work?

The work of the JVM takes place in four main stages:

1. class loading: JVM loads .class files through class loader, which creates the structure of Java code.
2. memory allocation: Then, the runtime allocates memory for the program in the data area, in which program data and memory are managed.
3. execution:The execution engine translates the bytecode into machine code and runs the program.
4. garbage collection: After the termination of the program, JVM frees the unused memory through garbage collection, which keeps the system running smoothly.

Advantages of JVM:

1. portabilityJava code can run on any platform because it uses JVM, making it possible to run the same code on different platforms.
2. Security: JVM provides a secure environment, protecting it from illegal access and harmful code.
3. automatic memory management: JVM does not require the programmer to manage memory, because it manages memory automatically.
4. multithreading support: JVM supports multithreading, allowing multiple companion processes to run simultaneously.

Disadvantages of JVM:

1. decrease in performance: JVM is slower than native code, which can reduce program performance.
2. memory usage high: JVM uses more memory, which requires more resources to perform sequential operations.
3. Complexity: The JVM can be a complex system, requiring program developers to understand its inner workings.

Thus, JVM makes Java a portable, secure and robust programming platform. Although there are some disadvantages, it has more advantages and hence Java has become one of the most famous programming languages ​​in the world.

Example:

As an example, imagine that you have written a Java program that sorts data tables. You have developed this program on your computer. Now, if this program has to be run on any other computer, then it can also run it with the help of JVM, without any modification. Without it, you would have to write programs in different ways for different platforms, which could be a waste of time and effort.

In this way, JVM makes Java code portable and usable, making programming easier and effective.